16. A 110 V, d.c. shunt generator delivers a load of 50 A. The armature resistance is 0.2 and field resistance is 55 . The generator is driven at 1800 r.p.m. It has 6 poles with 360 conductors connected in lap fashion. Calculate i) The no load voltage (ii) The flux per pole (Ans.: (i) 120.4 V (ii) 0.011 Wb) 17. A long shunt compound generator delivers a load current of 50 A at 500 V. It has armature, series field and shunt field resistance of 0.05 $2, 0.03 2 and 250 2 respectively. Calculate the generated c.m.f. (Ans.: 504.16 V) 18. A d.c. machine has 8 poles, lap connected armature with 960 conductors and flux per pole is 40 mWb. It is driven at 400 r.p.m. Calculate the generated e.m.f. If now lap connected armature is replaced by wave connected, calculate the speed at which it should be driven to generate 400 V. (Ans. 250 V, 156 r.p.m.)

There are 144 slots in a 3-phase, 16-pole, 50 Hz., star connected alternator. There are 4 conductors in each slot and all the conductors in a phase are connected in series. Coil span is 1500 electrical and the flux per pole is 0.05 Weber sinusoidallly distributed. Calculate the emf induced per phase.

The emf generated in each conductor of a 6-pole simplex wave armature winding is 0.48 V. If the armature has 42 slots and 125 commutator segments, and there are four turns per armature winding element, find the terminal voltage of the generator. a. 288 V b. 264 V c. 192 V d. 240 V

A 6 pole wave wound d.c. shunt generator has 500 conductors. A generator delivers 50 kW of power at 250 voltage at full load. The resistance of the field circuit is 125 2. Actual brush shift is 10°. Then find the demagnetizing and cross magnetizing ampere turns per pole and how many additional turns must be wound on each pole to eliminate the demagnetizing effect.

A 4-pole, d.c. generator has a wave-wound armature with 792 conductors. The flux per pole is [751.3 r.p.m.] 1. 0.0121 Wb. Determine the speed at which it should be run to generate 240 V on no-load. 2. A 20 kW compound generator works on full-load with a terminal voltage of 230 V. The armature, series and shunt field resistances are 0.1, 0.05 and 115 Q2 respectively. Calculate the generated e.m.f. when the generator is connected short-shunt. [243.25 V] (Elect. Engg. Madras Univ. April, 1978) 3. A d.c. generator generates an e.m.f. of 520 V. It has 2,000 armature conductors, flux per pole of 0.013 Wb, speed of 1200 r.p.m. and the armature winding has four parallel paths. Find the number of poles. [4] (Elect. Technology, Aligarh Univ. 1978) When driven at 1000 r.p.m. with a flux per pole of 0.02 Wb, a d.c. generator has an e.m.f. of 200 V. If the speed is increased to 1100 r.p.m. and at the same time the flux per pole is reduced to 0.019 Wb per pole, [209 V] 4. what is then the induced…

A 6 pole generator with wave wound armature has 54 slots each having 22 conductors. The flux per pole is 0.01 Wb.   (i) At what speed must the armature rotate to give an induced EMF of 230V is, (ii) What will be the voltage developed, if the winding is lap connected and the armature rotates at the same speed is,

An Armature runs at 250 r.p.m. and generates an e.m.f. at 50 Hz. There are 216 slots each containing 5 conductors. The winding is distributed and full pitch. All the conductors of each phase are in series and flux per pole is 30 mWb which is sinusoidal distributed.Calculate the number of pole.

A 4 pole dc generator runs at 750 rpm and generates an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb, If leakage coefficient is given as the ratio of the total flux/pole to the working flux per pole, find its value.

The shunt generator wave-winding generates induction voltages 60 V at speed 1000 r.p.m and the number of sluts 20 and in each slut 100 conductors . If it is rotating at a speed of 1500 r.p.m to generate a voltage of 80 volts , finding the ratio of the flux . ( The total number of slots equal 40 sluts )

A long shunt compound generator delivers a current of 10A at 200V and has a series field resistance and shunt field resistance of 1 ohm and 200 ohms respectively. Then line current is a. 2A b. 1A c. 9A d. 10A